ISL12008 Datasheet, PDF (4/19 Pages) Intersil Corporation – I2C Real Time Clock with Battery Backup

ISL12008
Serial Interface Specifications Recommended Operating Conditions. Unless otherwise specified. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
f_SCL
t_IN
SCL Frequency
Pulse width Suppression Time at SDA and
SCL Inputs
Any pulse narrower than the max
spec is suppressed.
t_AA
t_BUF
SCL Falling Edge to SDA Output Data Valid
Time the Bus Must be Free Before the Start
of a New Transmission
SCL falling edge crossing 30% of
V_DD, until SDA exits the 30% to
70% of V_DD window.
SDA crossing 70% of V_DD during
a STOP condition, to SDA
crossing 70% of V_DD during the
following START condition.
t_LOW Clock LOW Time
Measured at the 30% of V_DD
crossing.
t_HIGH Clock HIGH Time
Measured at the 70% of V_DD
crossing.
t_SU:STA START Condition Setup Time
t_HD:STA START Condition Hold Time
t_SU:DAT Input Data Setup Time
t_HD:DAT Input Data Hold Time
t_SU:STO STOP Condition Setup Time
t_HD:STO STOP Condition Hold Time
t_DH Output Data Hold Time
t_R
SDA and SCL Rise Time
SCL rising edge to SDA falling
edge. Both crossing 70% of V_DD.
From SDA falling edge crossing
30% of V_DD to SCL falling edge
crossing 70% of V_DD.
From SDA exiting the 30% to 70%
of V_DD window, to SCL rising edge
crossing 30% of V_DD.
From SCL falling edge crossing
30% of V_DD to SDA entering the
30% to 70% of V_DD window.
From SCL rising edge crossing
70% of V_DD, to SDA rising edge
crossing 30% of V_DD.
From SDA rising edge to SCL
falling edge. Both crossing 70% of
V_DD.
From SCL falling edge crossing
30% of V_DD, until SDA enters the
30% to 70% of V_DD window.
From 30% to 70% of V_DD
MIN
(Note 8)
1300
1300
600
600
600
100
20
600
600
0
20 +
0.1 x Cb
TYP
MAX
(Note 5) (Note 8) UNITS NOTES
400
kHz
50
ns
900
ns
ns
ns
ns
ns
ns
ns
900
ns
ns
ns
ns
300
ns
6, 7
t_F
SDA and SCL Fall Time
From 70% to 30% of V_DD
20 +
0.1 x Cb
300
ns
6, 7
Cb
Capacitive Loading of SDA or SCL
Total on-chip and off-chip
10
400
pF 6, 7
Rpu SDA and SCL Bus Pull-Up Resistor Off-Chip Maximum is determined by t_R
1
and t_F.
For Cb = 400pF, max is about
2kΩ to~2.5kΩ.
For Cb = 40pF, max is about 15kΩ
to ~20kΩ.
kΩ 6, 7
NOTES:
2. FT/OUT inactive.
3. LPMODE = 0 (default).
4. In order to ensure proper timekeeping, the V_{DD SR-} specification must be followed.
5. Typical values are for T = +25°C and 3.3V supply voltage.
6. Limits should be considered typical and are not production tested.
7. These are I²C specific parameters and are not tested, however, they are used to set conditions for testing devices to validate specification.
8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
4
FN6690.1
September 26, 2008